Here's a recent one of Rosario at Del Mar:
http://www.youtube.com/watch?v=i-nIAYVn-to
If you go to PartyManner's site on Youtube -- I"m sure you'll find some races from the Mid 90's where ESPN would use the jockey cam. I know Exchange's win on the grass at Del Mar was one of them.
It annoyed the hell out of me when they'd cut to it during the race because obviously you don't see anything but a bobbing horse head and whatever is directly in front of said horse.